LOANS, LEASES & ALLOWANCE FOR LOANS AND LEASE LOSSES - LOANS BY CREDIT QUALITY INDICATOR (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 6,102,666	$ 5,001,271
Ratio of Grade Class to Gross Loans	100.00%	100.00%
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 3,541,663	$ 2,980,795
Mortgage | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,461,213	2,885,604
Mortgage | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	80,450	95,191
Home equity
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,156	3,604
Home equity | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,156	3,604
Warehouse & other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	506,031	385,413
Warehouse & other | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	506,031	385,413
Multifamily real estate secured
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	1,276,934	1,185,531
Multifamily real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	1,166,521	1,051,696
Multifamily real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	110,413	133,835
Commercial real estate secured
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	98,791	61,403
Commercial real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	86,227	46,577
Commercial real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	12,564	14,826
Auto and RV secured
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	45,293	13,140
Auto and RV secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	45,293	13,140
Factoring
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	145,485	122,200
Factoring | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	145,485	122,200
Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	480,939	248,584
Commercial & Industrial | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	344,101	248,584
Commercial & Industrial | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	136,838
Other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	4,374	601
Pass
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 6,033,001	$ 4,917,881
Ratio of Grade Class to Gross Loans	98.90%	98.30%
Pass | Mortgage | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 3,423,247	$ 2,855,637
Pass | Mortgage | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	73,891	87,256
Pass | Home equity | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,104	3,473
Pass | Warehouse & other | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	501,500	375,588
Pass | Multifamily real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	1,158,436	1,036,718
Pass | Multifamily real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	105,084	127,839
Pass | Commercial real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	86,227	46,577
Pass | Commercial real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	10,169	9,947
Pass | Auto and RV secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	44,969	12,630
Pass | Factoring | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	145,485	122,200
Pass | Commercial & Industrial | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	342,911	239,415
Pass | Commercial & Industrial | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	136,838
Pass | Other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	1,140	601
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 37,219	$ 47,325
Ratio of Grade Class to Gross Loans	0.60%	1.00%
Special Mention | Mortgage | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 19,713	$ 11,256
Special Mention | Mortgage | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	64	216
Special Mention | Home equity | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	17	0
Special Mention | Warehouse & other | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	4,531	9,825
Special Mention | Multifamily real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	4,839	10,926
Special Mention | Multifamily real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	2,781	3,470
Special Mention | Commercial real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Special Mention | Commercial real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	2,023	2,444
Special Mention | Auto and RV secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	17	19
Special Mention | Factoring | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Special Mention | Commercial & Industrial | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	9,169
Special Mention | Commercial & Industrial | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0
Special Mention | Other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,234	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 32,446	$ 36,065
Ratio of Grade Class to Gross Loans	0.50%	0.70%
Substandard | Mortgage | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 18,253	$ 18,711
Substandard | Mortgage | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	6,495	7,719
Substandard | Home equity | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	35	131
Substandard | Warehouse & other | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Substandard | Multifamily real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	3,246	4,052
Substandard | Multifamily real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	2,548	2,526
Substandard | Commercial real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Substandard | Commercial real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	372	2,435
Substandard | Auto and RV secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	307	491
Substandard | Factoring | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Substandard | Commercial & Industrial | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	1,190	0
Substandard | Commercial & Industrial | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0
Substandard | Other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 0	$ 0
Ratio of Grade Class to Gross Loans	0.00%	0.00%
Doubtful | Mortgage | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 0	$ 0
Doubtful | Mortgage | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Home equity | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Warehouse & other | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Multifamily real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Multifamily real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Commercial real estate secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Commercial real estate secured | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Auto and RV secured | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Factoring | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Commercial & Industrial | In-house originated
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0	0
Doubtful | Commercial & Industrial | Purchased
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	0
Doubtful | Other
Financing Receivable, Recorded Investment [Line Items]
Total gross loans and leases	$ 0	$ 0